Finding the Fourth Proportional to 42,543.59, 63,824.61 and 12,960.65

Step by Step Solution

1. Step 1: Write the proportion equation
   42,543.59 : 63,824.61 = 12,960.65 : x
2. Step 2: Convert to fraction form
   42,543.59/63,824.61 = 12,960.65/x
3. Step 3: Cross multiply
   42,543.59x = 63,824.61 × 12,960.65
4. Step 4: Simplify right side
   42,543.59x = 827,208,431.60
5. Step 5: Solve for x
   x = 827,208,431.60/42,543.59
6. Step 6: Final answer
   x = 19,443.79